Journal article
The magnetic moment of NiO nanoparticles determined by Mössbauer spectroscopy
Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Magnetic Systems, Department of Micro- and Nanotechnology, Technical University of Denmark2
Department of Micro- and Nanotechnology, Technical University of Denmark3
Department of Physics, Technical University of Denmark4
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark5
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark6
We have studied the magnetic properties of 57Fe-doped NiO nanoparticles using Mössbauer spectroscopy and magnetization measurements. Two samples with different degrees of interparticle interaction were studied. In both samples the particles were characterized by high-resolution transmission electron microscopy and x-ray diffraction and found to be plate-shaped.
Computer simulations showed that high-field Mössbauer data are very sensitive to the size of the uncompensated magnetic moment. From analyses of the Mössbauer spectra we have estimated that the size of the uncompensated magnetic moment is in accordance with a model based on random occupation of surface sites.
The analyses of the magnetization data gave larger magnetic moments, but the difference can be explained by the different sensitivity of the two methods to a particle size distribution and by interactions between the particles, which may have a strong influence on the moments estimated from magnetization data.
Language: | English |
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Year: | 2006 |
Pages: | 4161-4175 |
ISSN: | 1361648x and 09538984 |
Types: | Journal article |
DOI: | 10.1088/0953-8984/18/17/005 |
ORCIDs: | Bahl, Christian Robert Haffenden , Hansen, Mikkel Fougt and Pedersen, Thomas |